Candidate: Rafael Rivelino da Silva Bravo
Program: UFSC / POSMEC
Date: August, 2002
Advisor: Victor Juliano De Negri
Abstract: This work presents the study of two prototypes of cartridge valves: the first one is a directional valve and the second is a flow control valve with pressure compensation. The prototypes were supplied by the BOSCH REXROTH GROUP company through a partnership with the Hydraulic and Pneumatic Systems Laboratory of the Federal University of Santa Catarina.The work begins with the presentation of cartridge valves, including operational principles and associated characteristics. The cartridge valves are useful considering that they generate compact systems with reduction of cost and time of installation, being possible to substitute more traditional valves as spool valves. A non linear mathematical model is proposed for each prototype, they were applied to give theoretical results through numerical simulation. In addition, are presented some phenomena that have significant influence in the design and performance of fluid power components. By a test bench is done the validation of static and dynamic model of the directional valve, allowing to obtain the coefficients and to evaluate of specific aspects of the component. The theoretical results for the flow control valve are analyzed and compared with the experimental results for three operational ranges, considering steady state conditions. The analysis of the results allows the identification and determination of the influence of the main parameters.
BRAVO, R. R. S. Modelagem e Análise Válvulas Cartucho. 2002. 131 p. Dissertação (Mestrado em Engenharia Mecânica). Universidade Federal de Santa Catarina, Florianópolis.